99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/********************************************************************************
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* sched/wdog/wd_gettime.c
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*
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* Copyright (C) 2007, 2009, 2014-2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/wdog.h>
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#include <nuttx/irq.h>
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#include "wdog/wdog.h"
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/********************************************************************************
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* Public Functions
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********************************************************************************/
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/********************************************************************************
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* Name: wd_gettime
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*
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* Description:
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* This function returns the time remaining before the specified watchdog
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* expires.
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*
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* Parameters:
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* wdog = watchdog ID
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*
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* Return Value:
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* The time in system ticks remaining until the watchdog time expires. Zero
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* means either that wdog is not valid or that the wdog has already expired.
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*
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* Assumptions:
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*
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********************************************************************************/
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int wd_gettime(WDOG_ID wdog)
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{
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irqstate_t flags;
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/* Verify the wdog */
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flags = enter_critical_section();
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if (wdog && WDOG_ISACTIVE(wdog))
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{
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/* Traverse the watchdog list accumulating lag times until we find the wdog
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* that we are looking for
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*/
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FAR struct wdog_s *curr;
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int delay = 0;
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for (curr = (FAR struct wdog_s *)g_wdactivelist.head; curr; curr = curr->next)
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{
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delay += curr->lag;
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if (curr == wdog)
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{
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leave_critical_section(flags);
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return delay;
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}
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}
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}
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leave_critical_section(flags);
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return 0;
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}
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